Sync demonstrations_v2 with latest (#1464)

## Summary:
- Sync v2 with latest demonstrations
- Update `demonstrations_v2/tutorial_hidden_cut/requirements.in` to
include `galois`

## Other fixes:
- New demo chebychev points at incorrect large image path, causing
Sentry to blow up while verifying images (from this PR
#1466)

Author: Alan-eMartin

demonstrations/tutorial_quantum_chebyshev_transform.metadata.json

@@ -6,7 +6,7 @@
         }
     ],
     "dateOfPublication": "2025-07-22T00:00:00+00:00",
-    "dateOfLastModification": "2025-07-25T00:00:00+00:00",
+    "dateOfLastModification": "2025-07-26T00:00:00+00:00",
     "categories": [
         "Algorithms",
         "Quantum Machine Learning"
@@ -19,7 +19,7 @@
         },
         {
             "type": "large_thumbnail",
-            "uri": "/_static/demo_thumbnails/large_demo_thumbnails/thumbnail_quantum_chebyshev_transform.png"
+            "uri": "/_static/demo_thumbnails/large_demo_thumbnails/thumbnail_large_quantum_chebyshev_transform.png"
         }
     ],
     "seoDescription": "Implement the Quantum Chebyshev Transform in PennyLane.",